Underdash A/C unit

fordman · Post by **fordman** » Thu Dec 08, 2005 5:06 pm

the factory units come with the heater core inside of them. they exit out the back and through the firewall. you may have to drop it back out and look at the back of it to see but there is suppose to be a heater core in there.

fordman · Post by **fordman** » Thu Dec 08, 2005 5:19 pm

ok check these pics out. the trucks without a/c had two holes in the firewall that the heaterhoses went through. when you put in a factory a/c the holes now have to be moved as you can see in the second picture. for the exception of 67 which ive never seen under the hood of one of them alk the trucks i have seen have four holes in the firewall. two are usally plugged. the two that are plugged are the ones that you need to unplug and run the hoses through there to hook to the heater core. if there isn't a heater core in it at all you'll have to split the box open and put one in it. maybe your old one. if it will fit. here are the pics.

http://www.fordification.com/images/FAQ ... -cover.jpg

http://www.fordification.com/images/FAQ ... nhose2.jpg

fordman · Post by **fordman** » Thu Dec 08, 2005 5:23 pm

here are the heater hose locations. kind of at the back and bottom.

http://www.fordification.com/board/factACback.jpg

and these are the correct holes that the factory a/c exit the firewall. also in this pic you can see the cable that comes out of the firewall that hooks to the valve on the hoses.

http://www.fordification.com/images/FAQ ... -holes.jpg

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 6:11 pm

Ok, I just felt up under there and found the 2 holes, no nipples for the hoses to go on though. I will pull it next week and see what I can figure out.

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 6:30 pm

Yep, just looked at it. Needs a new heater core. Both nipples are broken off. How do I get the heater core out of this thing. Please tell me this is going to be easier than it looks.

fordman · Post by **fordman** » Thu Dec 08, 2005 6:35 pm

you have to take it back out and take the case apart. be careful of the vents. i replaced my core a couple of years ago and when i was putting it back in i knocked one of the vents out. in order to fix it i have to take it back out well guess what i still haven't done it. but be carefull. there are a few bolts that will have to come out to open the case up.

Post by **FORDification** » Thu Dec 08, 2005 6:36 pm

I hate to be the bearer of bad news, but that factory A/C unit needs to be almost completely disassembled to get to the heater core. Back on Oct. 30th I spent the day in the shop tearing one of these down. I took a bunch of pictures and got started putting together a page, but got sidetracked and haven't finished it up. I'll mess around with it a little more tonight and see if I can't have it ready to post either tonight or maybe tomorrow night.

However, like I said, it's a lot of work. But look at the bright side: when you do get it replaced, you'll be very qualified to answer any questions about the unit, since you're going to have first-hand experience on a complete disassembly.

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 6:38 pm

Gee, um, THANKS.

. I guess I will go get it out of the truck and put on the bench to get started on.

flyflinger · Post by **flyflinger** » Thu Dec 08, 2005 6:54 pm

I just read through this thread. I feel bad that you are having to take the thing all apart. If I knew this was the case( errrr, situation), I would have let you know.

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 7:39 pm

Hey flyflinger, no big deal. It's just a good thing that I like working on my truck

. well I got it apart and will post pics in just a few minutes.

Post by **FORDification** » Thu Dec 08, 2005 7:52 pm

I guess I was a little farther along on the page than I thought. It didn't take much to finish it up, with what I had to work with. I didn't have any notes so I was pretty much going by memory and referencing the photos. When I start disassembling the second unit to use for parts, I'm going to take some detailed notes and will post a tech page tutorial about replacing the heater core. Take a look here:

Tearing down a factory A/C unit

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 7:53 pm

First pic you can see where they are broken.

This is the only problem with the entire unit other than some bent and dirty fins. This will give me a little time and opportunity to fix and clean the fins and the entire unit

.

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 7:56 pm

First I split it down the middle with a very large hammer,

, wanted to. there are screws that hold it together EVERYWHERE. Then I had to take the A/C coil out just 6 screws there.

Heavenlyfire · Post by **Heavenlyfire** » Thu Dec 08, 2005 7:59 pm

Then, there is a plate on top of the heater core. Oh, and 4 more screws holding the core in. Now do you see why I used the drill

. It is all apart now and ready to be cleaned and refurbished. Now to find a new heater core.

fordman · Post by **fordman** » Thu Dec 08, 2005 8:21 pm

you can get a new one for 20-30 at the parts place i think. i got mine for about that through my dads shop years ago.

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